Ashly PowerFlex 470 운영 매뉴얼 - 페이지 14
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페이지 인쇄Operating Manual - Powerflex Multi-Channel 70V Power Amplifier
signal level higher than +12.8 dBu will cause distortion in
the amplifier. Turning down the input level controls will
not eliminate distortion if the input headroom is exceeded.
Turn down the output level of the device driving the am-
plifier instead.
Additionally, an input signal may already be dis-
torted before it gets to the amp. Check to see if a piece of
equipment in the signal chain before the amp is clipping.
For best performance, the amplifier should be operated with
input levels fully CW. Also check for damaged speaker
drivers that could cause distorted sound.
11.3
Hum or Buzz Noise
Be sure that the power cord's 3-prong plug is con-
nected to a properly earth-grounded outlet. Lifting the
grounding third prong may not improve hum or buzz and
can create a potential shock hazard.
12.
POWERFLEX DIMENSIONS
P rotect
Thermal
Signal
14
16.94"
18.5"
Ch annel 1
Ch annel 2
Ch annel 3
Ch annel 4
Ch annel 5
Ch annel 6
Powerflex
Clip
P ower
19"
Hum is usually caused by ground currents flow-
ing between different pieces of equipment. Ground cur-
rents can be minimized by using a single point AC ground
for the sound system, and by using balanced connections
with quality cable throughout the audio path. The Input
Signal Ground switch may be pressed out to disconnect
the signal source equipment signal ground from the am-
plifier.
Buzz, as well as certain audible high frequency
tones, can be caused by environmental emissions such as
lighting dimmers, neon lights, or computer equipment. Use
balanced connections, and try moving the amplifier, wir-
ing, lighting, or other equipment to different locations to
isolate the source of the noise.
Sections 3.3, 5.3, 7.1, and 7.2 further discuss is-
sues related to grounding and noise problems.
2.25"